/**
  ******************************************************************************
  * @file    usb_pwr.c
  * @author  MCD Application Team
  * @version V4.0.0
  * @date    21-January-2013
  * @brief   Connection/disconnection & power management
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT 2013 STMicroelectronics</center></h2>
  *
  * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
  * You may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
  *
  *        http://www.st.com/software_license_agreement_liberty_v2
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "usb_lib.h"
#include "usb_conf.h"
#include "usb_pwr.h"
#include "hw_config.h"

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
__IO uint32_t bDeviceState = UNCONNECTED; /* USB device status */
__IO boolean fSuspendEnabled = TRUE;  /* true when suspend is possible */  // HJI
__IO uint32_t EP[8];

struct
{
	__IO RESUME_STATE eState;
	__IO uint8_t bESOFcnt;
}
ResumeS;

__IO uint32_t remotewakeupon = 0;

/* Extern variables ----------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Extern function prototypes ------------------------------------------------*/
/* Private functions ---------------------------------------------------------*/

/*******************************************************************************
* Function Name  : PowerOn
* Description    :
* Input          : None.
* Output         : None.
* Return         : USB_SUCCESS.
*******************************************************************************/
RESULT PowerOn(void)
{
	uint16_t wRegVal;

	/*** cable plugged-in ? ***/
	//USB_Cable_Config(ENABLE);

	/*** CNTR_PWDN = 0 ***/
	wRegVal = CNTR_FRES;
	_SetCNTR(wRegVal);

	/*** CNTR_FRES = 0 ***/
	wInterrupt_Mask = 0;
	_SetCNTR(wInterrupt_Mask);
	/*** Clear pending interrupts ***/
	_SetISTR(0);
	/*** Set interrupt mask ***/
	wInterrupt_Mask = CNTR_RESETM | CNTR_SUSPM | CNTR_WKUPM;
	_SetCNTR(wInterrupt_Mask);

	return USB_SUCCESS;
}

/*******************************************************************************
* Function Name  : PowerOff
* Description    : handles switch-off conditions
* Input          : None.
* Output         : None.
* Return         : USB_SUCCESS.
*******************************************************************************/
RESULT PowerOff()
{
	/* disable all interrupts and force USB reset */
	_SetCNTR(CNTR_FRES);
	/* clear interrupt status register */
	_SetISTR(0);
	/* Disable the Pull-Up*/
	//USB_Cable_Config(DISABLE);
	/* switch-off device */
	_SetCNTR(CNTR_FRES + CNTR_PDWN);
	/* sw variables reset */
	/* ... */

	return USB_SUCCESS;
}

/*******************************************************************************
* Function Name  : Suspend
* Description    : sets suspend mode operating conditions
* Input          : None.
* Output         : None.
* Return         : USB_SUCCESS.
*******************************************************************************/
void Suspend(void)
{
	uint32_t i = 0;
	uint16_t wCNTR;
	uint32_t tmpreg = 0;
	__IO uint32_t savePWR_CR = 0;
	/* suspend preparation */
	/* ... */

	/*Store CNTR value */
	wCNTR = _GetCNTR();

	/* This a sequence to apply a force RESET to handle a robustness case */

	/*Store endpoints registers status */
	for (i = 0; i < 8; i++) EP[i] = _GetENDPOINT(i);

	/* unmask RESET flag */
	wCNTR |= CNTR_RESETM;
	_SetCNTR(wCNTR);

	/*apply FRES */
	wCNTR |= CNTR_FRES;
	_SetCNTR(wCNTR);

	/*clear FRES*/
	wCNTR &= ~CNTR_FRES;
	_SetCNTR(wCNTR);

	/*poll for RESET flag in ISTR*/
	while ((_GetISTR()&ISTR_RESET) == 0);

	/* clear RESET flag in ISTR */
	_SetISTR((uint16_t)CLR_RESET);

	/*restore Enpoints*/
	for (i = 0; i < 8; i++)
		_SetENDPOINT(i, EP[i]);

	/* Now it is safe to enter macrocell in suspend mode */
	wCNTR |= CNTR_FSUSP;
	_SetCNTR(wCNTR);

	/* force low-power mode in the macrocell */
	wCNTR = _GetCNTR();
	wCNTR |= CNTR_LPMODE;
	_SetCNTR(wCNTR);

	/*prepare entry in low power mode (STOP mode)*/
	/* Select the regulator state in STOP mode*/
	savePWR_CR = PWR->CR;
	tmpreg = PWR->CR;
	/* Clear PDDS and LPDS bits */
	tmpreg &= ((uint32_t)0xFFFFFFFC);
	/* Set LPDS bit according to PWR_Regulator value */
	tmpreg |= PWR_Regulator_LowPower;
	/* Store the new value */
	PWR->CR = tmpreg;
	/* Set SLEEPDEEP bit of Cortex System Control Register */
#if defined (STM32F30X) || defined (STM32F37X)
	SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;
#else
	SCB->SCR |= SCB_SCR_SLEEPDEEP;
#endif

	/* enter system in STOP mode, only when wakeup flag in not set */
	if ((_GetISTR()&ISTR_WKUP) == 0)
	{
		__WFI();
		/* Reset SLEEPDEEP bit of Cortex System Control Register */
#if defined (STM32F30X) || defined (STM32F37X)
		SCB->SCR &= (uint32_t)~((uint32_t)SCB_SCR_SLEEPDEEP_Msk);
#else
		SCB->SCR &= (uint32_t)~((uint32_t)SCB_SCR_SLEEPDEEP);
#endif
	}

	else
	{
		/* Clear Wakeup flag */
		_SetISTR(CLR_WKUP);
		/* clear FSUSP to abort entry in suspend mode  */
		wCNTR = _GetCNTR();
		wCNTR &= ~CNTR_FSUSP;
		_SetCNTR(wCNTR);

		/*restore sleep mode configuration */
		/* restore Power regulator config in sleep mode*/
		PWR->CR = savePWR_CR;

		/* Reset SLEEPDEEP bit of Cortex System Control Register */
#if defined (STM32F30X) || defined (STM32F37X)
		SCB->SCR &= (uint32_t)~((uint32_t)SCB_SCR_SLEEPDEEP_Msk);
#else
		SCB->SCR &= (uint32_t)~((uint32_t)SCB_SCR_SLEEPDEEP);
#endif

	}
}

/*******************************************************************************
* Function Name  : Resume_Init
* Description    : Handles wake-up restoring normal operations
* Input          : None.
* Output         : None.
* Return         : USB_SUCCESS.
*******************************************************************************/
void Resume_Init(void)
{
	uint16_t wCNTR;

	/* ------------------ ONLY WITH BUS-POWERED DEVICES ---------------------- */
	/* restart the clocks */
	/* ...  */

	/* CNTR_LPMODE = 0 */
	wCNTR = _GetCNTR();
	wCNTR &= (~CNTR_LPMODE);
	_SetCNTR(wCNTR);

	/* restore full power */
	/* ... on connected devices */
	Leave_LowPowerMode();

	/* reset FSUSP bit */
	_SetCNTR(IMR_MSK);

	/* reverse suspend preparation */
	/* ... */

}

/*******************************************************************************
* Function Name  : Resume
* Description    : This is the state machine handling resume operations and
*                 timing sequence. The control is based on the Resume structure
*                 variables and on the ESOF interrupt calling this subroutine
*                 without changing machine state.
* Input          : a state machine value (RESUME_STATE)
*                  RESUME_ESOF doesn't change ResumeS.eState allowing
*                  decrementing of the ESOF counter in different states.
* Output         : None.
* Return         : None.
*******************************************************************************/
void Resume(RESUME_STATE eResumeSetVal)
{
	uint16_t wCNTR;

	if (eResumeSetVal != RESUME_ESOF)
		ResumeS.eState = eResumeSetVal;

	switch (ResumeS.eState)
	{
		case RESUME_EXTERNAL:
			if (remotewakeupon == 0)
			{
				Resume_Init();
				ResumeS.eState = RESUME_OFF;
			}

			else /* RESUME detected during the RemoteWAkeup signalling => keep RemoteWakeup handling*/
			{
				ResumeS.eState = RESUME_ON;
			}

			break;

		case RESUME_INTERNAL:
			Resume_Init();
			ResumeS.eState = RESUME_START;
			remotewakeupon = 1;
			break;

		case RESUME_LATER:
			ResumeS.bESOFcnt = 2;
			ResumeS.eState = RESUME_WAIT;
			break;

		case RESUME_WAIT:
			ResumeS.bESOFcnt--;

			if (ResumeS.bESOFcnt == 0)
				ResumeS.eState = RESUME_START;

			break;

		case RESUME_START:
			wCNTR = _GetCNTR();
			wCNTR |= CNTR_RESUME;
			_SetCNTR(wCNTR);
			ResumeS.eState = RESUME_ON;
			ResumeS.bESOFcnt = 10;
			break;

		case RESUME_ON:
			ResumeS.bESOFcnt--;

			if (ResumeS.bESOFcnt == 0)
			{
				wCNTR = _GetCNTR();
				wCNTR &= (~CNTR_RESUME);
				_SetCNTR(wCNTR);
				ResumeS.eState = RESUME_OFF;
				remotewakeupon = 0;
			}

			break;

		case RESUME_OFF:
		case RESUME_ESOF:
		default:
			ResumeS.eState = RESUME_OFF;
			break;
	}
}

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
